I've seen them on ebay before, and I think Demon Tweeks do them too.
Do a google search for "Dzus Fasteners" and see what comes up - they're available in different sizes so probably best to check before you order. They're not cheap though, I think about a fiver each!!

Well, I also looked and noted that the pics of the Dzus fasteners look just as, well corroded, as mine when they're brand new...? Can you email a picture of them and if we can do a deal I'll have enough for all the fairing bolts. Looking for the flush ones with the alan key rather than then floppy D pieces.